(b) Calculate the growth rate of the capital stock K(t), assuming that saving in this economy is proportional to total output ,i.e. S(t) = sY(t),and the goods market is in equilibrium. Define the answer you get in this part as Gk . [Hint: Use the relationship between net and gross investment in Chapter 4.] (c) Now, assume there is no population growth in this economy, i.e. N(t) = N . Use the definition of the total output growth rate to find the relationship between the growth rate of total output, Gy , and Gk .